https://www.bleepingcomputer.com/news/security/the-week-in-ransomware-december-22nd-2023-blackcat-hacked/

Earlier this month, the BlackCat/ALPHV ransomware operation suffered a five-day disruption to their Tor data leak and negotiation sites, rumored to be caused by a law enforcement action.

The FBI revealed this week that they hacked the BlackCat/ALPHV ransomware operation, which raked in $300 million from over 1,000 victims. While quietly surveilling the ransomware gang, law enforcement retrieved decryption and Tor private keys.